Add DIR_METADATA files to //rlz

Add Generate DIR_METADATA files and remove metatada from OWNERS files for //rlz.

R=rogerta@chromium.org

Bug: 1113033
Change-Id: I4312267fdb91685d312da369c56b192bbd8d4937
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453448
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Roger Tawa <rogerta@chromium.org>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814427}

rlz/DIR_METADATA

+# Metadata information for this directory.
+#
+# For more information on DIR_METADATA files, see:
+#   https://source.chromium.org/chromium/infra/infra/+/master:go/src/infra/tools/dirmd/README.md
+#
+# For the schema of this file, see Metadata message:
+#   https://source.chromium.org/chromium/infra/infra/+/master:go/src/infra/tools/dirmd/proto/dir_metadata.proto
+
+monorail {
+  component: "Internals>Core"
+}
\ No newline at end of file

rlz/OWNERS

 rogerta@chromium.org
 thakis@chromium.org
-
-# COMPONENT: Internals>Core